#6 Flashcards
Alternator Voltage vs. Battery Voltage
The alternator voltage is higher than the battery voltage; the difference in voltage keeps the battery charged.
Pilot Controlled Temperature
Temperature is controlled by mixing cabin heat with outside air in a manifold near the cabin firewall
Oil four basic functions
Lubricates, Cools, Removes heat, Seals between cylinder wall and pistons, and Cleans by carrying away particles
Causes of Carburetor Icing and removal
most likely to occur when temperatures are 70F(21C) and humidity is above 80%. Carburetor vaporization causes a sudden cooling of the mixture. Air passing through Venturi becomes a lower pressure causing a decrease in temperature which also causes cooling. Water vapor is squeezed by cooling and if the temperature of the carburetor reaches 32 F or below, the moisture will be deposited as frost or ice
Carburetor Icing is removed with Carb Heat, activating Carb heat will cause a decrease in RPM/Manifold Pressure then a rise in RPM/Manifold Pressure if carburetor heat is present the RPM/Manifold Pressure will increase greatly after Carb heat is turned off
Anti Icing Equipment
- Thermal anti-ice
- Heated airfoil leading edges prevents the formation of ice and protects the airfoil
- Air may be heated from the engine or electrically
- Alcohol released on the surface of the wing or propeller
- Alcohol in fuel, as well as lead in fuel
- Inertial separators keeps ice out of the intakePitot tube - heated
- Static port - heated
- Fuel vents - heated
- Stall warning sensors - heated
- Thin graphite foil heating tape that is installed on ice prone areas Activation almost instantaneously raises the tape temperature, causing ice to lose its grip and be carried away by the relative airflow
- Carburetor heat is considered both anti and de-icing, however, could cause more problems if the ice re-freezes beyond the Venturi when the air expands
Deicing Defined
Anti-icing equipment prevents ice from forming on certain protected surfaces.
Deicing Equipment removes ice that has already formed on protected surfaces, usually pneumatic pumps inflate the leading edges of the wings to break the ice
(Just because the aircraft has anti icing or deicing equipment does not mean it is fit for flying into icing conditions)
Actions to take for Detonation
Ensure Proper Grade of fuel is used, Keep cowl flaps (if available) in full-open position during ground operations to maximize airflow, using rich mixture, as well as shallow climb angle, to increase cylinder cooling during takeoff and climb out, Avoid extended, high power, steep climbs, Develop habit of monitoring engine instruments to monitor proper operation practices
Detonation Defined
Detonation occurs when the fuel/air mixture explodes instead of burning evenly. Causing a roughness in the engine
Detonation Common Causes
Using lower grade of fuel then specified or very high engine temperatures.
Pre-ignition Defined
the premature combustion of the fuel-air mixture in an internal combustion engine.
